Coated metal lath



g w. c. CORYELL 4 COATED METAL LATH Filed Dec. 25. 1922 Patented Aug. 2, 1927.

U ITED STATES PATIENT OFFICE. 1

WILLIAM CLAYTON CORYELL, OF YOUNGSTOWN OHIO ASSIGNOB, BY IESNE ASSIGN- MENTS, TO TBUSCON STEEL OOMPANY, OF YOUNGSTOWN, OHIO, A CORPORATION or MICHIGAN.

COATED METAL LATE.

Application filed December 23, 1922. Serial No. 608,778.

This invention relates to the subject ofin Figure 3 represents an interior core of metal lath manufacture, and primarily has in view a product of that kindpossesslng certain commercial and structural advans i tages, and obviating wastage of plaster in building operations;

Therefore, a principal object of the invention is to provide what may be termed a coated metal lath having as its distinctive J characteristic a slow burning or non-burn ing substance constituting its exterior surface, and that substance is intended to completely cover and protect the strands and joints of the metal fabric, while at the same 5 time materially decreasing the areas of the openings of the lath without entirely closing such openings. The desirable results obtained are to make the lath rust-resisting to a maximum degree and also preventing the 9 great wastage of plaster which ordinarily falls through the openings of metal lath; This latter function of the new coated metal lath renders it unnecessary to apply to metal lath the usual preliminary coat of plaster.

With these and other objects in view as will be readily appreciated by those familiar with. the art, the invention consists of the novel combination of elements hereinafter illustrated, described and claimed.

1 Though susceptible of embodiment in a variet of forms the invention may be exemplifie by reference to the group of figures shown in the drawings in which Figures 1, 2 and 3 are detail views illuss trating the steps of the process in making one form of the product, and

Figures 4, 5 and 6 are similar; views showing the steps of the process in making another form of the product. r

Referring to these illustrations of the invention, Figurel illustrates a section of. a reticulated metal structure designated by the reference letter L, and preferably consisting of what is commonly known as expended metal lath, though an equivalent meshed metal fabric would answer the purose. the meshed fabric or lath L is given a substantial coat of a cementitious or plastic material designated by the numeral 1 which envelops the strands and the joints of the structure and that is repeated to the desired extent according to the thickness of coat de r d, but th u timate product as shown leaving the key openin In carrying forward the inventionthe expanded metal or meshed fabric and an envelope or matrix of the cementitious or plastic material which forms a web or surface for the finished product and only partly closes'the meshes of the lath or metal fabric, 2 for the 'plaster.

Additional features t at may be resorted to are suggested in Figures 4, 5 and 6, in which Figure 4 shows the use of striated fibres 3 laid on the metal lath in substantially parallel -order and staggered, preliminary to the coat of the plastic or cementitious material, or,.as shown in Figure 5, a criss-cros's arrangement 4 of fibres may be used preliminary to the application of the cementitious .or plastic coatin And,

as shown inFigure 6, the coating 0 the lath I may be given a mineral or earthy character- Istic by sprinkling t 'or dusting a mineral powder thereon, such as fine grains of sand, blast furnace slag, asbestos fibre, pulverized limestone, or other e 'uivalent substances, or as aimatter of act dessicated wood fibres might be employed for that purpose.

The cementitious or plastic material may be of a varied character. It may consist of an asphaltum compound containing vegetable or mineral fibres such as cotton threads,

excelsior 'or other wood fibres for instance asbestos fibres orrthe like. The efiect of the fibres is to reinforce the asphaltum at the edges of the openings. Also mineral pitch would be usable for the purpose, and linseed oil products mixed with earthy substances to produce a heavy-thick adhesive'substance may be employed.

According to the character of the coating compound it will be applied hot or cold, and

- in any case itis desirable that the adhesive or bonding material shall be sufiiciently viscous that the surface tension of the fluid is sufiicient to partially close-in the areas between the meshes of the metal structure. The introduction of the fibrous elements assists materially in reventing the viscous substance from entire 55 closing the openings or meshes of the metal framing or fabric. However, the closing of a negligible number of the o enings' or meshes would not interfere wit the free and full functioning of the invention.

While the coating of the metal fabric may ly combustible nature such as resin, rubber,

linseed oil, glue, cellulose and even paper matte, but also materials of a non-combustible or fire resisting nature such as cement, plaster of Paris, silicate of soda, aluminum sulphate and other inorganic compounds. The

available fibrous substances are likewise numerous such as hair, hemp, cotton, Wood fibres, et cetera, which may be applied in any suitable manner to the side of the metal structure, thereby constituting the coating substance.

From the foregoing it is thought that the essentials of the invention will be fully understood without further description, and various minor details or changes may be re sorted to without departing from the spirit or sacrificing the advantages thereof.

I claim 1. A coated metal lath including a meshed metal structure, and a plastic matrix with fibrous elements therein coating the metal structure.

2. A coated metal lath including a meshed metal structure, and a plastic matrix with fibrous, elements therein coating the metal structure and having key openings.

3. A coated metal lath consisting of an expanded metal structure having fibres thereon and an adhesive coating with openings coinciding with the meshes of the metal structure.

In testimony whereof he hereunto aflixes his signature.

WILLIAM CLAYTON CORYELL. 

